2007 | OriginalPaper | Buchkapitel
10. Material Aspects of Micro- and Nanoelectromechanical Systems
verfasst von : Christian Zorman, Prof., Mehran Mehregany, Prof.
Erschienen in: Springer Handbook of Nanotechnology
Verlag: Springer Berlin Heidelberg
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Abstract
Material
|
Distinguishing characteristics
|
Application examples
|
---|---|---|
Single-crystal silicon (Si) | High-quality electronic material, selective anisotropic etching | Bulk micromachining, piezoresistive sensing |
Polycrystalline Si (polysilicon) | Doped Si films on sacrificial layers | Surface micromachining, electrostatic actuation |
Silicon dioxide (SiO2) | Insulating, etched by HF, compatible with polysilicon | Sacrificial layer in polysilicon surface micromachining, passivation layer for devices |
Silicon nitride (Si3N4, Si
x
N
y
) | Insulating, chemically resistant, mechanically durable | Isolation layer for electrostatic devices, membrane and bridge material |
Polycrystalline germanium (polyGe), Polycrystalline silicon-germanium (poly Si–Ge) | Deposited at low temperatures | Integrated surface micromachined MEMS |
Gold (Au), aluminum (Al) | Conductive thin films, flexible deposition techniques | Innerconnect layers, masking layers, electromechanical switches |
Bulk ti | High strength, corrosion resistant | Optical MEMS |
Nickel-iron (NiFe) | Magnetic alloy | Magnetic actuation |
Titanium-nickel (TiNi) | Shape-memory alloy | Thermal actuation |
Silicon carbide (SiC) diamond | Electrically and mechanically stable at high temperatures, chemically inert, high Young's modulus to density ratio | Harsh-environment MEMS, high-frequency MEMS/NEMS |
Gallium arsenide (GaAs), indium phosphide (InP), indium arsenide (InAs) and related materials | Wide bandgap, epitaxial growth on related ternary compounds | RF MEMS, optoelectronic devices, single-crystal bulk and surface micromachining |
Lead zirconate titanate (PZT) | Piezoelectric material | Mechanical sensors and actuators |
Polyimide | Chemically resistant, high-temperature polymer | Mechanically flexible MEMS, BioMEMS |
SU-8 | Thick, photodefinable resist | Micromolding, High-aspect-ratio structures |
Parylene | Biocompatible polymer, deposited at room temperature by CVD | Protective coatings, molded polymer structures |
Liquid crystal polymer | Chemically resistant, low moisture permeability, insulating | BioMEMS, RF MEMS |